Improvement in ventilators



E. VAN 11001113311.

Ventilator.

NO. 211,872. Patented Feb. 4,1879.

: 01 al d UNI'I'ED S'I'ATES PATENT FFICE.

EZEKIEL VAN NOORDEN, OF BOSTON, MASSACHUSETTS.

IMPROVEM ENT IN VENTILATORS.

Specificaton forfi"1ing part of Letters Patent N0. 211,872, dated February 4, 1879; application filed December 16, 1878.

T0 all wh0m z't may concern:

Be it known that I, EZEKIEL VAN NO0R- DEN, of Boston, in the county of Sufl'olk and State of Massachusetts, have invented a new and useful Improvement in Ventilators, of which the following is a specification:

This improvement relates to that class of ventilators whieh are placed in the open air upon buildings, and it may be used eit-heras a ventilator or as a chimney-oap. It is en improvement, more particularly, upon what is known as the 'Emerson ventilator.

In the accompanying drawings, Figure 1 is an elevation of my improved ventilator or chimney eap; 2111(1 Fig. 2 is a. vertical section of the same.

a is the fine, and I) the lange, eonstructed as in the Emerson ventilator. Instead of supporting a flat disk over the top of the flue u, as in the Emerson ventilator, I support, by means of the posts c, en inverted cone, d, having its vertex pointing down into the flue (0, and quite near the surface of the same. Ths nverted cone may be provided with 21, roof of any desirable shape, preferztbly a slanting one, as in the drawings.

The advantage which is derived from the a plication of the inverted cone is, that it causes a. greater draft in the fiue than can be obtainecl by means of the disk in the Emerson ventilator, now so generally in use.

Wl1en the Wind blows against my ventilator it enters the fiaring opening presented at all sides by means of the flange b and cone d, and as it blows towa-rd the center of the surface of the flue increases in force as its passage be comes more narrow. The point or vertex of the invertecl cone carries the air close to the surface of the flue, so that t, by its tendency to procluee a vacumn, catches the air at the fine-opening and draws it swiftlyout, creating a strong draft, much more powerful than een be produced by (1. fla-t disk.

A mration would be to slightly cut off the point of the cone, protlucing an inverted frustum.

Having thus fully described my mprovcment, what I claim, and desire to secure by Letters Patent, is

The hereinbefore-described improvement in ventilators 0r ohimney-caps, consising of the combnation, With the flue (6 and fla-nge 1), of the inverted cone or frnstum d, the vertex being over and neer to the center of the flucopening, and the sides producng, in connection With said flange, a flaring entrance to and 21 swift draft across suoh flueopenin g, as above set forth.

EZEKIEL VAN NOORDEN. Witnesses:

HENRY W. WILLIAMS, B. W. WILLIAMS. 

